Lambda with Browser instance

index.js

const puppeteer = require('puppeteer');

exports.handler = function(event, context, callback) {
  
  getBrowser().then((browser) => {
    browser.newPage((page) => {
      // Code
    }); 
  });
}


let __browser;
getBrowser() {
  if (__browser) {
    return new Promise((resolve) => { resolve(__browser)});
  } else {
    return pupeteer.launch({}).then((browser) => {
      return __browser = browser;
    });
  }
}

There is an typo in line 18, it should be puppeteer.launch.